55378621 has 2 divisors, whose sum is σ = 55378622. Its totient is φ = 55378620.

The previous prime is 55378607. The next prime is 55378669. The reversal of 55378621 is 12687355.

55378621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33802596 + 21576025 = 5814^2 + 4645^2 .

It is a cyclic number.

It is not a de Polignac number, because 55378621 - 2¹⁵ = 55345853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55370621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27689310 + 27689311.

It is an arithmetic number, because the mean of its divisors is an integer number (27689311).

Almost surely, 2^55378621 is an apocalyptic number.

It is an amenable number.

55378621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55378621 is an equidigital number, since it uses as much as digits as its factorization.

55378621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 55378621 is about 7441.6813288396. The cubic root of 55378621 is about 381.1659043756.

The spelling of 55378621 in words is "fifty-five million, three hundred seventy-eight thousand, six hundred twenty-one".